What does polar notation define about a vector?

Polar notation specifically describes a vector in terms of its angle and magnitude. This representation is particularly useful in fields such as physics and engineering, where vectors often denote quantities like force, velocity, or displacement.

When a vector is expressed in polar notation, it provides the magnitude, which indicates how large the vector is, and the angle, which indicates the direction in which the vector is pointing relative to a reference axis, often the positive x-axis in a two-dimensional plane. This method of representation allows for straightforward visual interpretation and calculations involving multiple vectors, such as vector addition and resolution into component form.

In contrast, the other answer choices describe different aspects related to physical phenomena, but they do not accurately reflect the specific characteristics defined by polar notation. Understanding that polar notation centers on angle and magnitude is essential for working with vectors in various applications.